4.6.Â Handling User Input

If the port requires user input to build, configure, or
install, set IS_INTERACTIVE in the
Makefile. This will allow
“overnight builds” to skip it. If the user
sets the variable BATCH in his environment (and
if the user sets the variable INTERACTIVE, then
only those ports requiring interaction are
built). This will save a lot of wasted time on the set of
machines that continually build ports (see below).

It is also recommended that if there are reasonable default
answers to the questions,
PACKAGE_BUILDING be used to turn off the
interactive script when it is set. This will allow us to build
the packages for CDROMs and FTP.